{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "A new aliphatic enone , ( 17Z , 20Z ) - hexacosa - 17 , 20 - dien - 9 - one ( 3 ) , and one new bisindole alkaloid , gangenoid ( 6 ) , together with seven known compounds were isolated from the roots and aerial parts of Desmodium gangeticum ( family : Leguminosae ) ."}
{"Chemical": ["( 17Z , 20Z ) - hexacosa - 17 , 20 - dien - 9 - one", "bisindole alkaloid", "gangenoid"]}